See if page 7 of this PDF shows what you need. Site says it covers SC300 and 400. Save the PDF it's pretty detailed.
http://www.lextreme.com/Lexcompartlocate.pdf
SOURCE: 1992 sc300 lexus
it is under the vehicle, driver side, below the seating area, in front of the rear wheelwell, mounted on chassis in fuel line.
SOURCE: 92 lexus es300 knock sensor
Need to remove the upper and lower air intake manifold. There are two knock sensors for the front and rear pistons banks. If you plan to do this yourself it is about 1 to 2 hours. While you are at it, there is a short coolant bypass hose sitting in the same spot, replace it. Another problem with the knock sensor is the wire harness used to connect the two knock sensors into one connection sometimes wears out and contacts the metal on the engine causing false signals to the ECM, so replace this cable also.
Just did this last summer on my 99 ES300. Pretty easy.
DIYr
SOURCE: 1992 SC300 starts initially then won't start
fuel filter is hardly ever been a problem with a lexus or toyota.you need to check for spark at the plugs.then go from there.
SOURCE: 1992 lexus sc300 repair: Power Steering pump
replace the power steering pump. make sure you get crush rings for the hoses too. dont use stop leak stuff either because it WILL clog the filter in the power steering rack and then youll have to replace that too.
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